Answer:
A late payment fee will be charged to her account.
Explanation:
As mandated by law one is expected to pay outstanding credit card balances within a 21 days period after which you may face additional charges and restrictions.
Since in Devon's case she forgot her credit card bill for up to three months her account would have already been charged a late payment fee from the very first month and this fee will continue to increase in line with the Credit CARD Act of 2009.